Results from round 23:
Battery: 9 (47.4%)
Master of Puppets: 2 (10.5%)
Blackened: 3 (15.8%)
One: 5 (26.3%)
So, it seems that, contrary to the song's lyrics, you can kill the Battery. Onto round 23 and the TOP THREE.
01:
02:
03:
04: Battery
05: Welcome Home (Sanitarium)
06: Creeping Death
07: Fade to Black
08: Wherever I May Roam
09: The Unforgiven
10: Ride the Lightning
11: The Four Horsemen
12: Sad But True
13: Bleeding Me
14: The Outlaw Torn
15: The Unforgiven II
16: Fixxxer
17: Halo on Fire
18: Seek & Destroy
19: Spit Out the Bone
20: All Nightmare Long
21: The Day That Never Comes
22: No Leaf Clover
23: Rebel of Babylon
24: The Unnamed Feeling
25: Frantic